is a town in DeKalb County, Alabama, United States. At the 2000 census the population was 2,400. Henagar is located on top of Sand Mountain. Henagar Junior High School is Home of the Wildcats. Henagar is home to one of the few Drive-In theatres in the United States.
According to the U.S. Census Bureau, the town has a total area of 21.9 square miles (56.7 km²), of which, 21.9 square miles (56.6 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.14%) is water.